Hi Nick!
Welcome to planDisney. Thank you for sending us your wondEARful question about
Walt Disney World Resort annual passes.
Regular theme park admission tickets that remain fully unused and are not expired, or have been used but are being upgraded on the same day of use, may be eligible to be upgraded to select Walt Disney World Resort annual passes.
If you purchase a one-day theme park ticket for September 6 and use it, you will not be able to upgrade it to an annual pass on September 8. If you purchase a multi-day ticket to use on September 6, then you may be able to upgrade it. You are able to upgrade eligible multi-day theme park tickets to annual passes on any day up until the theme park ticket has been fully used or expired.
I encourage you to learn more about the new Walt Disney World Resort annual passes by
visiting this Disney Parks Blog link.
I hope this helps answer your question, Nick. If you have any other questions, please visit planDisney again. We are always hEAR to help you!
Wishing you a Magical Visit,
Priscila